The Oka, which is also often written as Oca in Spanish, is a river on the Cantabrian side of the Iberian Peninsula that flows through the lands of Biscay, in the Basque Country. It originates from the confluence, at Zugastieta, of several streams that come from the Goroño mountains, 601 m high; Oiz, 1,035 m; Bizkargi, 563 m, and Arburu, 552 m. It flows in a south/north direction until it finally empties into the estuary of Urdaibai. It has a length of 17 km. It should not be confused with the Oca river, which flows through the province of Burgos and is a tributary of the Ebro, or with the Oká, a Russian river that is a tributary of the Volga.
Source: Wikipedia.org
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